Pump



Feb. 1 1927,

R. W. ALLERTON PUM P Original Filed Aug. l0,

u jjfl.

* @idf m4: 'klo @brom/m34 l Patented Febo l, i937,

0F VIRGNEA.

PUMP.

Application filed August 10, 1923, Serial No. 655,645.V Renewed truly l, 1926.

This invention relates to improvements in pumps. e

It is one object of the present invention to provide an improved high pressure pump, oi the duplex double-acting` type in which the plunger chambers, suction and discharge passa-ges and valve bores, are all formed in a single block oit metal. lt is a further oloject to provide an improved valve service for such pump, whereby each valve bore is arranged to contain a suction and a discharge valve the seats and cages 'for such valves being held in the bores in a novel manner so as to be wholly independent of each other for support. In the present arrangement, also, the icylinders are preferably undercut around liners positioned therein so that oneV is intended for use generally in high pressure work where a solid metal body is desirable in that it provides for a minimum number of openings subject to danger of leakage, the present construction will also be found of `great value in handling hot liquids, such, for example, as are encountered in the production of gasoline from heavier petroleum products under modern cracking' processes, as the comparatively smallnumber of joints, such as those at the cylinder heads, piston rod stuing boX and valve bore sealing` devices, present in the pump and which are more or less subject to leakage due to different coeiiici'ents of expension of the metal in contact with the hot oil, will have a tendency to 2@greatly reduce danger of leakage, while the design et such joints and their accessibility is such that leakage thereat may readily and quickly be taken care of while the pump is in operation. In hot liquid use, also, the independent mounting` ot a suction and a discharge valve in each valve bore so as to-be independent of each other ior support, will enable quick repairs to be made thereto, and such .valves and their seats will of course be formed ci materials havingthe characteristic ott high thermal resistance. llhen designed for hot oil use, the pump Awill preferably be provided with a novel form of piston rod stuffing box, in which suitable provision will be made not only for return to the pump cylinder of oil leaking along the piston rod betore it reaches the outer end of the stuiiing box or the stuiiing box packing, but also for keeping.;- down the temperature of thatpart of the piston rod which is exposed to the atmosphere, and for this purpose the length of the stullinghox is such that the part of the piston rod which isin direct contact with the hot oil in the plunger chamber will not be exposed to the atmosphere. whereby danpger oi tiring; oi oil thereon by exposure to air will be avoided. j

To enable others skilled in the art to understand the invention, the same will now be described in detail in connection with the accompanying drawine's showing a preferred embodiment thereof, and the novel features of the invention will then be pointed out in the claims.

lin the drawings- Figure l is a top plan view, partly in section, of the improved pump;

Figure 2 is a section on the line 2--2 ot Fin'. 1; i

Figure 3 is a section on the line 3-3 of 1, and

Figure d is a longitudinal central section of the improved stuffing bon'.

lieterrinp1 now to the drawings, the pump comprises a body portion il() formed oi' a metal block., preferably forged steel, of approximately rectangular shape. rlhe length of this block will depend, ot course, upon the length of the plunger stroke and also upon the number loi? suction and discharge valves to be employed. ln the present arrangement, such valves are located in bores an ranged in alined rows and `at such` point in the metal block Q0 as to cut through plung er chambers 21 and inlet and discharge passages 22, 23. respectively, vsuch valve bores beine` shown as arranged at right angles to the `plunger chambers and the inlet and discharge passages. ln ythe present showing, also, three suction valves 24.-. and three discharge valves 25 are provided on each side ot each ot the doubleacting; plungers 26, a

suction valve and a discharge valve being lo cated-in alinement in each valve bore. The plungers are actuated by piston rods 27 errtending through stuffing; bones 28, the design of which asshown is especially inlili? lill? `positionedfand held against longitudinal inoveinentin at least one directionby a pcripheral. iiange 82 formed thereon, such ange abutting against the portion 30, While .set screwsh adjustable from a point outside of themetal block 20, are also provided for holding the liners' 2l against loi'igitudinal movement in the opposite direction and are riOidly held in position and against rotary movement thereby. Under cutting of the plunger chambers around .the liners 3l as above described provides additional space Within such chambers and thereby enables a much shorter billet to be used than otherwise would Vbe the case, as one or more of the suction and discharge valve bores may be positioned so as to open Within suoli undercut area and still provide for free flow of liquid through such openings. A

Although it Will be understood that any desired number of suction and discharge valves may be employed, as shown the pres- `ent pump has three suction valves and` 1three discharge valves for each endof the doublev acting plungers. It will be understoothhmvever, that the invention may be applied. in single-acting pumps. The suction valve construction comprises a seat l of usual construction positioned in the valve bore which cuts through the, inlet passage 22 (Fig. B), the ball valve 24: thereof, above referred to, being held in a cage 2 resting on such seat and held down by a. threaded collar 3 and annular lock nut 4. The valve bore above the lock nut t is slightly larger than `the di ameter of the suction val-vc bore, so as to provide an annular shoulder 5 on Which the seat 6 for the ball 25 of the discharge valve rests. vThe `ball of this valve is also provided With a cage 7 arranged to hold the valve seat 6 down by engagement of cage 7 therewith which is lheld in placeby a threaded collar 8 and an annular lock nut il. The top or outer portion of the valve iore above such discharge valve is also preferably closed by a packed plug l() held by a threaded plug 1]. and screiv l2. The cages of the suction valves are preferably provided with valve stops 13 which may be so positioned, and of suoli length as to function with the cages inserted with either end up. 1n case `of leakage, it Will be obvious that the plug l() may be tighteend by screuv 12 and thereby adjust the papking. i By this construction, With a suction and a discharge valve in each bore, repairs to the pump are greatly facilitated and the number of openings in the metal body of the pump Where leakage is to be guarded against is re du ed and any such leakage can also be readily corrected. By mounting these valves independently of each other, the discharge valves may be withdrawn for repair Without disturbing the suction valves, and repairs 'further facilitated.

Referring non* particularly to Fig.. 4, the stufling boi; shown at 28, above `referred to, which is secured to the pump body in the usual manner, may advantageously 4be eniployed iii a pump such as above described, especially Whenused for hot oil Work. ln the construction shown, the stuffing boi: is of a length proipiortionate to the stroke of the pump so that the part vof the plunger rod Q7 which comes` into contact with the hot oil in the plunger chamber Will not be. exposed to contact with the atmosphere on the outstrokes of the plunger rods. Such stufiing boites` also,v are preferably provided with an open sleeve or lantern gland let between the packing and pump chamber. Coinn'iunicating with the outer end of the chamber formed by the sleeve or lantern gland la there is preferably provided a cold oil connection 15, whereby cold oil may be maintained in such chamber under a pressure preferably higher than that Within the plunger chamber. wWhatever leakage lof oil there may be, therefore, is of the cold oil along the vplunger rod into the plunger chamber, so that the packing 16. located be` tween the outer end of the stufling box and such cold oil chamber, is required to 'prevent leakage of cold oil only. lVith this construction, danger of firing of hot oil leaking past the stutiing box packing is avoided, and the hot part of the piston rod which is in direct .contact with the hotoil in the plunger chainber is not exposed to the atmosphere nor -does it come in contact With the packing. lThis stutiing box construction forms thesubject mattei' of a separate application Serial No. 731.539. sied 'augi2, 192i.

It will be understood that various changes may be made in the details of construction herein shown and described, While still retaining the. invention defined by the claims.

What is claimed is:

l. A pump formed of a metal block having a plunger chamber and suction and discharge passages formed therein, a plunger arranged to operate in said chamber, a valve bore cutting through the side of said plunger chamber and said suction and discharge passages. and suction and discharge valves arranged in said valve bore.

2. A pump formed of a metal block having a plunger chamber formedv therein, suction and discharge passages arranged parallel to said plunger chamber, a plunger arranged to operate in said chamber, valve bores cutting through the side of said plunger chamber and said suction and discharge passages, and suction and discharge valves arranged in said valve bores.

3. A pump comprising a one-piece metal body having parallel plunger chambers formed therein, suction and discharge passages parallel with and between said plunger chambers, plungers insaid plunger chambers, valve bores between the plunger chambers and passages and cutting through said plunger chambers and said suction and discharge passages, and a suction and discharge valve arranged in each of said Valve bores.

el. A pump comprising a one-piece metal body havingl plunger chambers formed therein, double-acting plungers in said chambers, suction and discharge passages arranged parallel with and between said plunger chambers, a plurality of valve bores for each end oiI each chamber arranged between said plunger chambers and passages and cutting through said plunger chambers and said suction and discharge passa-ges, and suction and discharge valves located 1n said valve bores.

5. A pump comprising a one-piece metal body having a plunger chamber and suction and discharge passages formed therein, a plunger arranged to operate in said plunger chamber, a valve bore cutting through said plunger chamber and said suction and discharge passages, suction and discharge valves arranged in said valve bore, and means for securing said valves in place independently of each other.

6. A pump formed of a metal block and having valve bores cut partially through the block, a suction and discharge valve in each olf said bores,- plugs 10 closing said bores, and threaded plugs 11 outside said plugs carrying screws 12 engaging said plugs 10.

7. A pump formed of a metal block and having a. valve bore, suction valve seat 1 and suction valve cage 2 in said bore, threaded sleeve 3 holding said cage, a shoulder onl said bore outside the sleeve, discharge valve seat 6 and valve cage 7 supported by said shoulder, and means 'for holding cage 7 in place and closing the valve bore.

In testimony whereof, I have hereunto set my hand.

ROBERT W. ALLERTON. 

